A simple AMI-RZ transmitter based on single-arm intensity modulator and optical delay interferometer

✍ Scribed by Guo-Wei Lu; Lian-Kuan Chen; Chun-Kit Chan

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 236 KB
• Volume: 255
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2005.05.039

✦ Synopsis

In the paper, we propose and demonstrate a simple alternate-mark inversion return-to-zero (AMI-RZ) transmitter upgraded from existing plain RZ-OOK transmitter by employing an additional Mach-Zehnder delay interferometer (MZDI), eliminating the use of high-speed RF circuit and dual-drive Mach-Zehnder modulator. A delay-and-subtract operation is performed by the MZDI on the RZ-OOK signal to achieve alternating phases in successive mark pulses. The nonlinearity tolerance of the generated AMI-RZ signal was characterized by experiment at 10 Gb s À1 and simulation at 40 Gb s À1 . The ghost-pulse, due to intra-channel four-wave-mixing (IFWM), with generated AMI-RZ and RZ-OOK formats was also investigated respectively at 40 Gb s À1 . The results showed that the generated AMI-RZ exhibited higher nonlinear tolerance over RZ-OOK, especially the tolerance against IFWM in the 40-Gb s À1 optical transmission system. This AMI-RZ transmitter scheme is simple, potentially low cost and can be integrated easily with the existing RZ-OOK transmitters for upgrading to AMI-RZ transmitters.